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20
SOP 10
Check valves
SOP 11
SOP 12
Installing the pump head
1.
Make sure that the pump head is properly assembled,
especially check step 13 of the SOP 9 "Assembling the
pump head".
2.
Position the head in a straight line onto the pump housing.
3.
Tighten all four pump head set screws, item 3.3 a few turns
by hand.
4.
Alternating from one to the next, tighten two diagonally
opposed screws half a turn at a time, until the pump head is
correctly seated.
5.
Tighten the two remaining screws. Make sure that all four
pump head set screws, item 3.3 are securely tightened.
6.
Connect the solvent tubings according to SOP 3
"Connection of eluent tubings" on page 11.
If check valves are contaminated they will no longer open and
close correctly. You can remove the check valves for cleaning
purposes from the pump head. Disassemble them according to the
following instructions.
Replacing check valves
1.
Remove the connection to the solvent reservoir.
2.
Remove the bushing on the inlet side 3.5. The lower check
valve 3.10 can now be removed together with the bushing.
3.
Remove the complete capillary connection 3.22 between the
two pump chambers. Loosen the screw fittings alternating, to
avoid bending the capillary.
4.
Remove the bushing from the outlet side 3.6.
5.
Remove the upper check valve 3.10 using a pair of
tweezers.
Cleaning check valves
1.
Place the valve in a suitable cleaning solution. Use an
ultrasonic bath to clean the valve. If malfunction persists,
use steps 2...5 of this SOP
2.
Using a knife or similar, remove the valves seals from the
housing carefully.
3.
Remove the individual components by gently tapping the
housing on the table
Valve ball and seating are adjusted in pairs. An exchange of
these parts leads to malfunction of the check valve. Therefore
take care, that any exchange will be avoided, when cleaning
more than one check valves simultaneously.
4.
Clean the individual parts. We recommend an ultrasonic
bath.
Maintenance by the user
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